hello and welcome to health care magic,Intrinsic factor
is a factor which is responsible for the proper absorption of vitamin B12
in the body and is an important in its functions. So a deficiency will cause all the problems of Vit B12 deficiency which can be numerous and serious.
Needless to say that you must start vitamin replacement therapy in consultation with your doctor and also consult a gastroenterologist
who can better help you out in the proper management of the problem
Dr Sriram Nathan